Anodic Protection Assessment Using Alumina-Forming Alloys in Chloride Molten Salt for CSP Plants

Fernández, Ángel G.; Cabeza, Luisa F.

doi:https://doi.org/10.3390/coatings10020138

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Issue date

2020

Author

Fernández, Ángel G.

Cabeza, Luisa F.

Suggested citation

Fernández, Ángel G.; Cabeza, Luisa F.; . (2020) . Anodic Protection Assessment Using Alumina-Forming Alloys in Chloride Molten Salt for CSP Plants. Coatings, 2020, vol. 10, num. 2, p. 138-1-138-12. https://doi.org/10.3390/coatings10020138.

Abstract

The generation of a natural protective coating in alumina-forming alloys was analyzed using a ternary chloride molten salt as a thermal energy storage material for concentrated solar power (CSP) technology. The formation of the protective layer was monitored using electrochemical impedance spectroscopy

(EIS). A protective layer model for the OCT alloy and a localized corrosion model for the OCI and OC4 alloys were obtained after 5 h of immersion. The corrosion rates calculated using the linear polarization technique (LPR), were 8.03, 21.55, and 7.61 mm/year for OC4, OCI, and OCT alloys, respectively. These results were confirmed by scanning electron microscopy and X-ray diffraction. Our analysis showed that MgAl2O4 was the main protective coating generated by the alumina-forming alloys.

URI

http://hdl.handle.net/10459.1/67953

DOI

https://doi.org/10.3390/coatings10020138

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Coatings, 2020, vol. 10, num. 2, p. 138-1-138-12

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Except where otherwise noted, this item's license is described as cc-by (c) Ángel G. Fernández, Luisa F. Cabeza, 2020